[Randy99]

50-75 HP I'd venture to guess as the difference (back-up motor hasn't been dynoed in years, nor freshend up lol)...if there were some sort of vaccum leak in the fuel system or at the intake like you previously spoke about don't you think I would have seen a rise in water temperature?...I know anytime in the passed when i was fighting a lean condition or had any type of leak (intake or exhaust) it was noticable on the gauges...the motor would pick up about 10 degrees (h2o temp) ...when my motor went temps were all still in perfect operating order...motor made that flat sound, stumbled abit, water and oil temp spike, oil pressure and fuel pressure dropped, and then she made a lotta smoke...the biggest mystery is the size of the hole in piston #6...lean conditons on a SBC usually lead to a melted piston in #3 0r 5, no?

Thanks for your input Jon! I'm always looking for someone else who could lead me to an answer.

P.S...only thing different was the fuel pump and carb...motor builder took the carb that was on the motor when it blew up to "research"...fuel pump also stayed on the other motor...2 possible issues but i highly doubt it